package com.lwt.monstermall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.lwt.monstermall.common.to.es.SkuEsModel;
import com.lwt.monstermall.common.utils.R;
import com.lwt.monstermall.search.config.ElasticConfig;
import com.lwt.monstermall.search.constant.EsConstant;
import com.lwt.monstermall.search.feign.ProductFeignService;
import com.lwt.monstermall.search.service.MallSearchService;
import com.lwt.monstermall.search.vo.AttrResponseVo;
import com.lwt.monstermall.search.vo.BrandVo;
import com.lwt.monstermall.search.vo.SearchParam;
import com.lwt.monstermall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @program: monstermall
 * @author: 大怪
 * @create: 2022-02-19 16:04
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService service;

    //去es进行检索
    @Override
    public SearchResult search(SearchParam param) {
        SearchResult result = null;
        //动态构建出复杂的查询语句

        //1、准备检索请求
        SearchRequest request = buildSearchRequest(param);

        try {
            //2.执行检索请求
            SearchResponse response = client.search(request, ElasticConfig.COMMON_OPTIONS);


            //3.分析响应数据，封装成指定格式
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        /**
         * 模糊匹配，过滤（按属性，分类，品牌，价格区间，库存）
         */
        //1.构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2 bool-filter -按照三级分类查询
        if (param.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2 bool-filter -按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2 bool-filter -按照所有指定的属性查询
        if (param.getAttrs() != null && param.getAttrs().size()>0){
            for (String attrStr : param.getAttrs()) {

                BoolQueryBuilder nestBoolQuery = QueryBuilders.boolQuery();

                String[] s = attrStr.split("_");
                String attrId = s[0];//检索的属性ID
                String[] attrValues = s[1].split(":");//这个属性检索的值
                nestBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }


        }

        //1.2 bool-filter -按照库存查询

        if (param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }

        //1.2 bool-filter -按照价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if (s.length ==1){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[1]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前所有的条件都拿过来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }
        //2.2 分页
        sourceBuilder.from((param.getPageNumber()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3 高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }
        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

        //TODO 1、聚合brand
        //品牌子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //TODO 2、聚合catalog
        //2. 分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //TODO 3、聚合attr
        //属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析出当前attr_id对应的所有可能的属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL"+s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }


    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();
        SearchHits hits = response.getHits();

        List<SkuEsModel> list = new ArrayList<>();
        if (hits.getHits()!= null && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                list.add(skuEsModel);
            }
        }

        //1.返回的所有查到的商品
        result.setProducts(list);

        //2.当前所有商品涉及到的所有属性
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1.得到属性id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            //2.得到属性名
            String attr_name = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attr_name);

            //3.得到属性值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);


        }

        result.setAttrs(attrVos);

        //3.当前所有商品涉及到的所有品牌
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1.得到品牌id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            //2.得到品牌名
            String brand_name = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brand_name);

            //3.得到品牌名
            String brand_img = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brand_img);

            brandVos.add(brandVo);
        }

        result.setBrands(brandVos);

        List<SearchResult.CatalogVo> catalogVos =new ArrayList<>();
        //4.当前商品涉及到所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));

            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //5.分页信息，页码
        result.setPageNum(param.getPageNumber());

        //总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        //总页码
        int totalPages =(int) total%EsConstant.PRODUCT_PAGESIZE == 0?(int) total/EsConstant.PRODUCT_PAGESIZE:((int) total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);


        //6.构建面包屑导航功能
        if (param.getAttrs()!=null && param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //分析每一个attrs传过来的查询参数
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = service.getAttrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    String attrName = data.getAttrName();
                    navVo.setNavName(attrName);
                } else {
                    navVo.setNavName(s[0]);
                }

                //取消面包屑以后, 我们要跳转到哪个页面，将请求地址的url里面的当前位置置空
                //拿到所有查询条件，去掉当前。
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.monstermall.com/list.html?"+replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        //品牌，分类
        if (param.getBrandId() != null && param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();

            navVo.setNavName("品牌");
            //TODO 远程查询
            R r = service.brandsInfo(param.getBrandId());
            if (r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName()+";");
                    replace = replaceQueryString(param,brandVo.getBrandId()+"","brandId");

                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.monstermall.com/list.html?"+replace);
            }
            navs.add(navVo);
        }



        return result;
    }

    private String replaceQueryString(SearchParam param, String attr,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(attr, "UTF-8");
            encode = encode.replace("+","%20");//浏览器对空格编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"=" + encode,"");
    }

}
